Fixed few typos and bit fields not aligned with the spec. Define other
related macros that will be useful in the future.
Signed-off-by: NAtish Patra <atishp@rivosinc.com>
Link: https://lore.kernel.org/r/20220711174632.4186047-6-atishp@rivosinc.comSigned-off-by: NPalmer Dabbelt <palmer@rivosinc.com>